Cartridge case for firearms



Dec. 1, 1931. J. DESTREE 1,834,030

CARTRIDGE CASE FOR FIREARMS Original Filed Nov. 25, 1926 Josap/l DESTREE Patented Dec. 1, 1931 UNITED STATES JOSEPH nEs'rREE, or BRUSSELS; eminar 1 oARrRIneE CASE FOR FIREARMS Original application filed November 23, 1926, Serial No. 150,353, and. in BelgiuniNovember 27, 1925. V

Divided and this application filed July 2, 1928. Serial No. 289,796.

The present invention relates to a cartridge case for use in fire arms with an inner recoil that is to say with fire arms in which, the

expanded by these gases as soon as it has left its percussion position. Moreover, as soon as the part of the obturator which is engaged in the barrel has left this barrel, the gases can escape through the rear opening of the barrel,

7 thus considerably reducing at this moment the motive action on the projectile leaving the barrel.

Until this day, the cartridge cases which have been used in fire arms with inner recoil, have been extracted by an extraction device engaging from the exterior toward the interior in a peripheral groove dug in the base of the cartridge. This method of extraction obliges either to dig a longitudinal groove in the barrel for the passage of the extractor,

or to reduce the diameter of the base of the cartridge case.

The presence of a longitudinal groove in the barrel of the fire arms permits the distortion and splitting of the cartridge case in the said groove during the recoil of the case under the pressure of the gases. The reduction of the diameter of the base is only practically possible with cartridge cases present- 40 ing a large diameter.

This invention has for its object to avoid these disadvantages. To this effect, the cartridge case according to, the invention is a cylindrical one, the base of which is provided with a recess behind the cap, the walls of this base presenting a flange projecting inwardly.

The accompanying drawings show by way of example several constructions according to the invention.

Figure 1 is an axial section throughsuch a cartridge case.

Figure 2 is a similar section through .a modified construction.

Figure 3 shows in perspective after axial section another construction of cartridge case according to the invention.

The base of the cartridge cases, shown in Figures 1 and 2, is extended at 1 beyond the cap 2 to be fired, and has in its rear portion a recess 3 enabling the firing pin to reach the said cap. The said recess comprises towards the interior a flange 4 enabling the case to be hooked or seized by an extractor introduced into the said recess. In the case of Figure 1, the extension 1 is sufliciently strong to Withstand the whole or part of the reactions which the case transmits to the obturator during the firing. In the case of Figure 2, these reactions will be transmitted directly by the bottom of the recess 3, and the extension will be exposed only to tensional stresses, and only during the extraction of the case.

The cartridge case shown by Figure 3 differs from that of Figures 1 and 2 by the fact that the depth of the recess 3 is very reduced, which results in a saving of material and in facilitating the machining. This reduction in depth is particularly appreciable when the lip of the extractor is of a rather great length.

The cylindrical extension 1 of the cartridge shell or case is extended rearwardly of the cap 2 a sufiicient distance to space the internal extracting flange 4t apart from the cap 2, so that the end of the extractor will not fire an unfired cap, when the extractor is automatically advanced into the recess 3, formed between the extracting flange and the cap. The extension is sufficiently strong to resist and cushion the impact of 0 the recoil produced by the firing of the cartridge.

What I claim is:

A small arms cartridge consisting of a shell having an integral end wall formed with a priming cap opening and also formed with an integral cylindrical extension projecting rearwardly of the end wall to provide a recess behind the firing cap, the extension having an annular integral extracting flange en. 10o

gageable by the extractor of a small arm, said internal extracting flange being spaced a sufficient distance from the end Wall to protect said cap against being fired by an extractor engaging the extracting flange of an unfired cartridge; a I

In testimony whereof I aflix my signature.

JOSEPH DESTREE. 

